I have a 2005 King Ranch F-150 Super Crew 4x4 with a Leer Topper, Factory Bf Goodrich Tires and 12,700 miles on her. Only Mods, K&N Cold air Fipk kit.
The other Day I started noticing a vibration coming from the Rear at 45-49mph. If I set the Cruise at 48, it is Bad, Feels like a Tire is Going to Come Off. Everything looks Ok.
ANy Suggestions, ANyone Else have any Problems in this area?
I will be trying to get her into the Dealer asap.
I just had my Tires Rotated and Balanced about 1,000 miles ago, but know I have a Vibration in the Steering wheel at all Speeds.
Thanks for any Input or Info. KR Paul

 

Possably lost a balancing weight when they were rebalacing it. Sucks but it happens. The tire would cause the vibration.

 

Had the same problem,
turned out to be e-brake was "dragging"
It was set to tight and as heat biult up it started to drag.
At first thought it was just sticking on but after lubing it (dealer did)
it was still causing vib. Backed off the adjusters on each brake and now it's perfect.

 

A vibration at 45-50mph is indicative of an out of balance driveshaft.
@ 65 mph it indicates a tire/wheel out of balance. Have the DS checked.

 

Sounds lke the parking brake not releasing fully, I had the same problem. It would show up as a really bad vibe at 45-50 MPH. Have the service department check the expander cams to see if they are rusted up and sticking. Let us know what you find out.